Software Development Tools

Convert text to Base64 format and decode Base64 strings

Format, validate, and minify JSON data with syntax highlighting and error detection

Inspect JSON in an interactive tree. Expand and collapse nodes, copy paths, and view formatted JSON.

Compare two JSON documents with structural path diff and formatted line diff. Client-side only.

Semver-aware package.json dependency diff and npm lockfile version map, plus full JSON structural diff.

Generate a starter .editorconfig with indent, EOL, charset, and language presets. Copy-ready.

Paste NDJSON or logs with embedded JSON. Filter by level, search, expand objects, and copy. Client-side only.

Parse Content-Security-Policy values, explain directives, flag common weak patterns, and copy an advisory stricter draft.

Generate Subresource Integrity hashes for script and link tags from a URL or file upload. SHA-256 and SHA-384.

Educational: from HTTP method and request headers, see if a cross-origin request would likely trigger a CORS preflight. No server calls.

Convert between YAML and JSON formats with validation and formatting

Convert XML to JSON and JSON to XML with validation and formatting controls. Client-side conversion for API payloads and integration workflows.

Format and validate YAML with consistent indentation. No conversion to JSON.

Build HTTP requests with URL, method, headers, and body. Send or copy as cURL or fetch snippet.

Parse raw HTTP response headers into a key-value list. Paste from DevTools, copy single headers or the full block.

Check SSL/TLS certificate validity, issuer, subject, and SANs. Paste PEM or upload .pem/.crt. Client-side only.

Check WCAG contrast ratio between foreground and background colors. See AA and AAA pass/fail for normal and large text.

Create copyable agendas for standups, sprint planning, retros, 1:1s, and kickoffs. Set duration and project name.

Compare team capacity and committed story points. Sprint length, team size, capacity %, optional velocity.

Generate timeboxed retro agendas: Start/Stop/Continue, 4Ls, Mad/Sad/Glad, Sailboat. Set team size and duration.

Calculate price per unit from total price and quantity. Compare two products to see which is cheaper per oz, kg, or any unit.

Calculate subnet mask, network address, usable range, and broadcast from CIDR notation (e.g. 192.168.1.0/24).

Validate JSON data against a JSON Schema. See errors with path and message.

Format and validate .env files. Normalize KEY=value, optional sort, check for duplicate keys.

Format and validate GraphQL documents (SDL and operations). Pretty-print and check syntax in your browser.

Check that your XML document and XSD schema are well-formed. Paste both and validate syntax.

Validate OpenAPI 3.x and Swagger 2.0 specs (YAML or JSON). Check required fields and structure.

Format and validate CSV or TSV data. Delimiter, quote style, trim. Check column consistency.

Look up MIME type from file extension or extension from MIME type. Browse common types.

Format and validate TOML. Re-serialize with consistent structure. No conversion to JSON.

Format and validate INI config files. [section] and key=value, optional sort, no duplicate keys.

Format shell and bash scripts. Indent and normalize. Runs in your browser with shfmt (WASM).

Convert between TOML and JSON with validation and formatting. Free TOML to JSON and JSON to TOML for Cargo, pyproject.toml, and config files

Convert between text and different number systems

Generate realistic sample data for testing, development, and prototyping with customizable schemas

Convert text between different casing conventions

Encode and decode HTML entities

Encode and decode URL components

Convert between Base64 and Image formats

Generate MD5, SHA1, SHA256, and SHA512 from text or file upload. File hash, checksum from file, verify file integrity. Client-side only.

Generate custom QR codes for URLs, text, contact info, and more with customizable colors and sizes

Generate secure, random passwords with customizable length, character types, and strength indicators

Convert between Unix timestamps and human-readable dates. Relative time: "in 2 hours", "3 days ago", "next Monday" to date, or date to relative. Timezone support.

Convert numbers 1–3999 to Roman numerals and Roman numerals to numbers. Two-way conversion with validation.

Generate RFC 4122 compliant UUIDs (v1 and v4) with multiple output formats for databases, APIs, and applications

Convert titles and phrases to URL-friendly slugs: lowercase, hyphenate, strip diacritics for URLs, CMS, and SEO

Convert ticket titles and feature names to valid git branch names: lowercase, hyphenate, strip invalid characters

Pick stacks and merge starter .gitignore, .dockerignore, .npmignore, .eslintignore, .prettierignore, or .cursorignore patterns. Copy-ready in your browser.

Escape and unescape text for JavaScript, JSON, HTML, XML, SQL, and regex. Safe string encoding for code and queries.

Compare two text or code snippets side-by-side or unified. Line numbers, ignore whitespace. Paste or type to diff.

Format and minify CSS. Beautify or collapse whitespace, remove comments. Free, client-side, no sign-up.

Compare two semantic versions and check if a version satisfies a range (e.g. ^1.2.0). Free online version compare for developers.

Convert Markdown to HTML and HTML back to Markdown. Support for headers, links, images, code blocks, lists, tables, and more

Count character or word frequency in text. Sort by count or name. Ignore case, spaces, or punctuation.

Count words, characters, sentences, and paragraphs in your text

Sort lines in ascending or descending order, remove duplicates, and strip blank lines

Decode, encode, and verify JWT with HS256 or RS256. Explain standard claims in plain language.

Decode JWT, inspect claims, and verify RS256-family signatures against JWKS keys using kid matching. Client-side only.

Generate and compare HMAC signatures for webhook and API request debugging. Supports SHA-256, SHA-384, and SHA-512 with hex or base64 output.

Verify webhook signatures for GitHub, Stripe, Slack, and generic HMAC payloads. Compare expected and received signatures instantly.

Decode PEM-encoded X.509 certificates. View subject, issuer, validity dates, and SANs – client-side only.

Inspect PEM CSRs and PKCS#8 private keys: subject, algorithms, RSA bits or EC curve. Client-side only.

Build, test, and debug regular expressions with instant match highlighting and flag support

Convert between CSV and JSON formats with smart parsing, custom delimiters, and file upload/download support

Test your clicks per second (CPS) with a timed click test. Choose 5 or 10 seconds and click as fast as you can. Free online click speed test.

Free online click counter. Count clicks with a simple +1 button. Add an optional label and reset anytime.

Free online scoreboard for two teams. Add points with +1, +2, +3 buttons. Customize team names and reset anytime.

Create bar charts and line graphs online. Enter labels and values, choose bar or line chart. Free online chart maker.

Format, beautify, and validate SQL queries with syntax highlighting. Support for multiple SQL dialects including MySQL, PostgreSQL, SQLite, and more

Generate Lorem Ipsum or code placeholders: variable names, JSON keys, function stubs. Customizable paragraphs, words, and formatting.

Parse, validate, and decode URLs with detailed component breakdown. Extract protocol, hostname, path, query parameters, and fragments from any URL

Format, beautify, and minify JavaScript code with syntax-aware output and one-click copy

Format, validate, and minify XML with clean indentation, error highlights, and quick copy/download

Parse cron expressions into readable schedules and generate cron strings with upcoming run previews

Build cron expressions with presets or custom fields. Get human-readable summary and next run times.

Look up HTTP status codes by number or name—see meanings, usage, and copy codes instantly

Look up characters by code point or by character. Browse the ASCII table (0–127) with names and copy codes instantly

Generate starter CLAUDE.md, AGENTS.md, GEMINI.md, Cursor .mdc rules, and CONTRIBUTING.md-style conventions from project type and stack. Generic templates when fields are empty.

Parse browser, OS, and device from any User-Agent string. Debugging, analytics, and support.

Compress and optimize images in your browser. Reduce file size with quality control, format conversion (JPEG, PNG, WebP), and optional resize. All processing client-side.

Build structured LLM prompts with role, task, context, format, and constraints. Presets for explain, summarize, draft, and more. Copy-ready, runs in the browser.

Convert octal chmod modes to rwx permission strings, binary triplets, and ls-style output. Copy chmod commands with setuid, setgid, and sticky. Client-side only.

Generate Claude Code Agent Skills (SKILL.md) with presets, optional scripts and references, ZIP download, and setup steps for ~/.claude/skills/. Runs in the browser.